Fixes cargo audit #843

	---
	name: Cargo fuzz build
	on:
	push:
	pull_request:
	types: [opened, synchronize, reopened]

	jobs:
	build_fuzzing:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	with:
	toolchain: nightly
	submodules: "true"
	- name: Install Rust toolchain
	run: rustup show
	- uses: actions/setup-python@v1
	with:
	python-version: 3.7
	- name: Install Python dependencies
	run: python -m pip install --upgrade pip setuptools wheel
	- name: Set up OpenSK
	run: ./setup.sh
	- name: Set up fuzzing
	run: ./fuzzing_setup.sh

	- name: Cargo fuzz build
	run: cd libraries/opensk && cargo +nightly fuzz build
	- name: Cargo fuzz build (libraries/cbor)
	run: cd libraries/cbor && cargo +nightly fuzz build
	- name: Cargo fuzz build (libraries/persistent_store)
	run: cd libraries/persistent_store && cargo +nightly fuzz build

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